What It Means
- Open Limit
Lennox Ducted Heating
Lennox Error Code Four Flashes
Ducted Heating:
Causes & actions from Lennox
How it shows
- a3 diagnostic led: Four Flashes
Check Primary Limit, Rol- lout Switches and Secon- dary Limits. Find source of Overtemperature. If all OK, Reset or Replace Limits as Necessary.
Applicable models & manual sources
- G24M
Open Limit
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
